Apparatus for Band Limiting in Sc-Fdma Communications Systems and Method Thereof

a technology of sc-fdma communication system and antenna, applied in the field of single-carrier frequency division multiple access (scfdma) communications system, can solve the problems of significant energy over a relatively large bandwidth, unsuitable for modern transmission system, and most transmission system band limitations imposed, so as to achieve fewer calculations and less time delay

Inactive Publication Date: 2009-01-08
LG ELECTRONICS INC
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0023]An object of the present invention is to provide a device and method for band limiting in a SC-FDMA communications system with fewer calculations.
[0024]Another object of the present invention is to provide a device and method for band limiting in a SC-FDMA communications system with less time delay.

Problems solved by technology

Moreover, most transmission systems have band limitations imposed by either the natural bandwidth of the transmission medium (copper wire, coaxial cable, optical fiber, etc.) or by governmental or regulatory conditions.
Thus, the challenge in data transmission systems is to obtain the highest possible data rate in the bandwidth allotted with the least number of errors (preferably none).
However, the trouble with the rectangular pulse is that it has significant energy over a fairly large bandwidth as indicated by its Fourier transform.
The unbounded frequency response of the rectangular pulse renders it unsuitable for modern transmission systems.

Method used

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  • Apparatus for Band Limiting in Sc-Fdma Communications Systems and Method Thereof
  • Apparatus for Band Limiting in Sc-Fdma Communications Systems and Method Thereof
  • Apparatus for Band Limiting in Sc-Fdma Communications Systems and Method Thereof

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Embodiment Construction

[0036]Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0037]Turning now to the drawings, FIG. 3 shows a structure of an OFDM (Orthogonal Frequency Division Multiplexing)-FDMA (Frequency Division Multiple Access) transmitter (300) which is one of SC-FDMA systems with a window (309), instead of the pulse shaping filter (209) in FIG. 2. As will be described in further detail in below, the window (309) has many advantages over the pulse shaping filter (209). Windowing is a technique used to shape the time portion of measurement data, to minimize edge effects that result in spectral leakage in the FFT spectrum. By using windows correctly, the spectral resolution of frequency-domain result will increase.

[0038]The band limiting of the SC-FDMA wireless mobile communica...

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Abstract

A method for band limiting in a Single Carrier Frequency Division Multiple Access (SC-FDMA) communications system comprises generating a SC-FDMA data symbol block and band-limiting the SC-FDMA data symbol block using a window (309). A transmitter in a SC-FDMA communications system comprises a SC-FDMA data symbol block generator which generates a SC-FDMA data symbol block and a window (309) for band limiting the SC-FDMA data symbol block. Using a window (309) for band limiting has an advantage to decrease the number of calculations because only multiplication's between the transmitted signal and the window (309) are required.

Description

FIELD OF THE INVENTION[0001]The present invention relates to Single-Carrier Frequency Division Multiple Access (SC-FDMA) communications systems, and more particularly, to an apparatus for band limiting in SC-FDMA communications systems and a method thereof.DISCUSSION OF THE RELATED ART[0002]In general, there are three types of multiple access methods, namely, Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), and Code Division Multiple Access (CDMA).[0003]Frequency Division Multiple Access (FDMA) is a form of signal multiplexing where multiple baseband signals are modulated on different frequency carrier waves and added together to create a composite signal.[0004]Time Division Multiple Access (TDMA) allows a number of users to access a single radio-frequency (RF) channel without interference by allocating unique time slots to each user within each channel.[0005]Code Division Multiple Access (CDMA) does not divide up the channel by time (as in TDMA), or ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04J11/00H04J1/00
CPCH04L5/023H04L25/03828H04W74/00H04W28/04H04L27/2626H04L27/2614H04L27/2605H04L27/2636H04L5/001
Inventor KIM, HAK SEONGKIM, BONG HOEROH, DONG WOOKAHN, JOON KUISEO, DONG YOUN
Owner LG ELECTRONICS INC
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